Leviticus 13:55-57

⁵⁵And the priest hath seen that which hath the plague after it hath been washed, and lo, the plague hath not changed its aspect, and the plague hath not spread, — it is unclean; with fire thou dost burn it; it is a fretting in its back-part or in its front-part.

⁵⁶'And if the priest hath seen, and lo, the plague is become weak after it hath been washed, then he hath rent it out of the garment, or out of the skin, or out of the warp, or out of the woof;

⁵⁷and if it still be seen in the garment, or in the warp, or in the woof, or in any vessel of skin, it is a fretting; with fire thou dost burn it — that in which the plague is.